Instructables
Using a standard Arduino single-board computer and a "shield" board, this project creates a MIDI sequencer that can record and play back sequences of MIDI notes.  It is similar to old-school sequencers in that the sequence is monophonic (one note at a time), and with each step in the sequence plays for one beat of the tempo.  Note that the sequencer doesn't make any sound itself; it generates a MIDI stream that can play a MIDI keyboard, a MIDI sound module or even a virtual instrument hosted on a computer.

You can see a short demo below.  I talk for a bit at the beginning, but hang in there, I do two demos of it.
 
 
 
The project consists of two commercially produced circuit boards.  The single-board computer (blue in the picture) can be purchased online for about $30, and comes fully assembled.  The "shield" board (red in the picture) comes partially assembled, but you will have to solder the pushbuttons, connectors and potentiometers (knobs).  It runs about $20 online.

What You Need For This Project
1 Arduino Uno or similar Arduino single-board computer
1 SparkFun MIDI Shield
1 Strip of 40 straight break-away headers with 0.1" spacing
A soldering iron with solder
Wire clippers
A computer (PC/Mac/Linux) with free Arduino software installed
A USB cable appropriate to connect the computer to your Arduino

Other Stuff Needed to Use the Sequencer
1 AC adapter for Arduino
2 5-pin DIN MIDI cables
1 MIDI keyboard or sound module
Speakers or headphones to listen

Sources
Arduino and AC adapter:
AdaFruit

MIDI Shield and headers:
SparkFun
Karlsson

I
f you are in a hurry to get started, many Radio Shacks also carry Arduinos.
 
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vanakaru6 months ago

It appears that the new version(2.1) of the Time library will work. So you should find the latest build-fork. You need to change the name still.

https://github.com/JChristensen/Timer/tree/v2.1

Here is the link to the 2.1 branch. Just change the name as vanakaru said.

Mudo10 months ago

I pursue the links and I found a Timer-Master library which (after rename to match the Arduino Standards) seems to have some lost functions (as console puked me…)

So… Any hint to solve it? Broken Links?

thanks!